Canadian Journal of Physics最新文献_第9页

Radioactive decay properties of superheavy element Z= 119 超重元素Z= 119的放射性衰变性质

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-04-17 DOI: 10.1139/cjp-2022-0301

N. Sowmya, A. M. Nagaraja, H. C. Manjunatha

引用次数: 0

Fermi velocity and effective mass of quasiparticles in bilayer phosphorene nanoribbons 双层磷烯纳米带中准粒子的费米速度和有效质量

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-04-14 DOI: 10.1139/cjp-2022-0037

Morad Ali Peyvand, Bahman Ravaee, M. Zare

{"title":"Fermi velocity and effective mass of quasiparticles in bilayer phosphorene nanoribbons","authors":"Morad Ali Peyvand, Bahman Ravaee, M. Zare","doi":"10.1139/cjp-2022-0037","DOIUrl":"https://doi.org/10.1139/cjp-2022-0037","url":null,"abstract":"Based on the Green’s function approach in combination with the tight-binding approximation, we have investigated the electronic properties of zigzag bilayer phosphorene nanoribbons (ZBLPNRs). A complete and fully reversible metal to semiconductor or insulator phase transition, has been observed via tuning a perpendicular electric field. We explain the effect of the interlayer hopping parameter on the electronic characterizations, namely, the energy band-gap, Fermi velocity and effective mass of carriers in biased ZBLPNRs. In the presence of the interlayer hopping term, the band structure of a ZBLPNR in the vicinity of the Fermi level has a form of two tilted Dirac cones, while, in the absence of it, the created cones are not tilted. Besides, the bands above and below the Fermi level are not symmetric,{it i.e.}, there is no electron-hole symmetry for both limits of the interlayer coupling. A remarkable tuning of both the Fermi velocity and the reciprocal effective mass can be observed by adjusting the external bias voltage. At certain critical bias voltages, the band edge reciprocal masses and carrier velocities become zero, {it i.e.}, the electrons exhibit a localization behaviour. This phenomenon indeed is a transition from massive to massless Dirac fermions and vice versa. The possibility of simultaneous control of the thermal and magnetic properties using an electric agent, which can be realized experimentally by using an perpendicular potential difference, open up possibilities for low power consumed thermomagnetic devices based on ZBLPNRs.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83861943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Approximate solutions of the transcendental equation for the square quantum wells by finding the real root of the cubic equation. 通过求三次方程的实根求平方量子阱超越方程的近似解。

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-04-14 DOI: 10.1139/cjp-2023-0004

J. Noël, L. Levesque

引用次数: 0

String cosmological scenario in periodic time-varying deceleration parameter in Lyra geometry 天琴座几何中周期时变减速参数中的弦宇宙学场景

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-03-27 DOI: 10.1139/cjp-2022-0203

V. Gore, A. Dixit, D. Chouhan

{"title":"String cosmological scenario in periodic time-varying deceleration parameter in Lyra geometry","authors":"V. Gore, A. Dixit, D. Chouhan","doi":"10.1139/cjp-2022-0203","DOIUrl":"https://doi.org/10.1139/cjp-2022-0203","url":null,"abstract":"In this paper, we have studied the bulk viscous fluid connected with string cosmological model in a higher dimensional (five dimensions) Bianchi type-III space–time in the framework of Lyra’s manifold. To get the deterministic solution of the field equations, we assume two physically appropriate conditions: ( i) θ in the model parameter that is proportional to the eigen value of [Formula: see text] of the shear tensor [Formula: see text] and ( ii) the periodic time-varying deceleration parameter q specified as q = mcos ( kt) − 1, where m, k > 0. In this paper, we have studied the periodic time-varying behaviour of a few quantities, such as the deceleration parameter q, the energy density ρ, the proper pressure p, the string tension density λ, the total pressure [Formula: see text], the energy density for particle ρp, and the displacement vector β( t), and we have discussed the physical significance of these quantities. It has been found that in the early stages of the universe’s evolution, string prevails over particles, whereas the universe is dominated by massive string at late time. It is also noted that the string phase of the cosmos does not vanish in the model since particle density is constantly positive throughout the universe’s history. In normal gauge treatment, β( t) acts like cosmological constant (Λ), and the solutions are compatible with observations. For the stability analysis, we have investigated the nature of various energy conditions (ECs). The positive behaviour of DEC indicates the model’s validation; on the other hand, SEC and WEC are violating, indicating the universe’s accelerated expansion.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90336393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Diffusion Monte Carlo calculations on the low-lying states of LaX (X = Ge, As, Te) LaX (X = Ge, As, Te)低洼态的扩散蒙特卡罗计算

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-03-24 DOI: 10.1139/cjp-2022-0152

Nagat Elkahwagy, A. Ismail

引用次数: 0

EFFECT OF GENERALIZED UNCERTAINTY PRINCIPLE ON ANHARMONIC OSCILLATOR 广义不确定原理对非谐振子的影响

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-03-10 DOI: 10.1139/cjp-2022-0303

Aniket Nag, S. Sahoo

引用次数: 0

Cosmic Expansion of the Universe Characterized by Anisotropic Viscous Fluid Cosmological Models 以各向异性粘性流体宇宙学模型为特征的宇宙膨胀

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-03-10 DOI: 10.1139/cjp-2022-0318

A. Dixit, Chanchal Chawla, A. Pradhan

{"title":"Cosmic Expansion of the Universe Characterized by Anisotropic Viscous Fluid Cosmological Models","authors":"A. Dixit, Chanchal Chawla, A. Pradhan","doi":"10.1139/cjp-2022-0318","DOIUrl":"https://doi.org/10.1139/cjp-2022-0318","url":null,"abstract":"In this paper, the cosmic expansion of the universe filled with viscous fluid has been discussed in Bianchi type-I space-time. To solve Einstein's field equations, a time-varying deceleration parameter, (q(t)) yields a time variable scale factor a(t) = [sinh(alpha t)]^{frac{1}{n}}, with `alpha' and `n' are positive constants. We also consider a time-varying gravitational constant (G) via the formulation 8pi G = G_{0}a^{m}, where `G_{0}' and `m' are positive constants. Further, based on the third constraint, two different viscous cosmological models, one by considering the perfect gas equation of state p=omega rho and the other by considering time-varying bulk viscosity coefficient (xi(t)), have been constructed. It is mentioned here that this particular choice of scale factor generates a class of accelerating models for n<1 while for n > 1, the transition of the universe from early deceleration to current acceleration takes place. An important feature of the models is decreasing dark energy candidate, i.e., cosmological constant (Lambda) with time, fine-tuning with the results from recent supernovae Ia observations. The various physical parameters involved in the models have been discussed analytically and graphically and are found in good agreement with recent observations. For the physical acceptability of both the models, energy conditions are shown graphically. The models are found to be physically acceptable, particularly in identifying the universe's transition. We have discussed the statefinder and observed that all the trajectories indicate dark energy candidates as Chaplying gas and quintessence for different constraints (alpha, n). We have also calculated the cosmographic parameters such as jerk, lerk, maxout to analyze the physical behavior of the DE models.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88261599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Retarded Solutions for Weyl Gravitoelectromagnetic Fields Weyl重力电磁场的延迟解

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-03-10 DOI: 10.1139/cjp-2022-0282

Armando Garza, Carlos Luna, J. Ramos

引用次数: 0

First-principles calculations on doped CrB4 掺杂CrB4的第一性原理计算

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-03-09 DOI: 10.1139/cjp-2022-0194

Chenda Xiao, Min Xu, S. Feng, Feiran Deng, Yi Huang, Feng Miao, LingWei Xiang

引用次数: 0

Structural transformation and anomalous diffusion in network forming liquid GeO2 形成网络的液态GeO2的结构转变和异常扩散

IF 1.2 4区物理与天体物理

Canadian Journal of Physics Pub Date : 2023-03-09 DOI: 10.1139/cjp-2022-0270

M. T. Lan, N. Hong

{"title":"Structural transformation and anomalous diffusion in network forming liquid GeO2","authors":"M. T. Lan, N. Hong","doi":"10.1139/cjp-2022-0270","DOIUrl":"https://doi.org/10.1139/cjp-2022-0270","url":null,"abstract":"In this study, we simulated the structural transformation and self-diffusion mechanism in liquid GeO2 oxide system. Under compression, structure of liquid GeO2 model tends to transform gradually from low-density phase to high-density phase. Concentration of basic structural units can be determined via density of material model. The average Ge-O bond distance in GeO4 tetrahedra is smaller than the ones in GeO5 pentahedra and GeO6 octahedra. Each GeOx polyhedron always exists a Ge-O bond with the longest length (the weakest bond). The diffusion mechanism in liquid GeO2 Oxide system is via the breaking the weakest bonds that accompanying the change local coordination environment of Ge cations. The longest Ge-O bond in a GeO5 pentahedron is very weak in comparison to the one in other polyhedra. The diffusivity is significantly dependent on the number of GeO5 pentahedra. The increase of GeO5 under compression is the origin of anomalous diffusion in liquid GeO2 oxide. The increase of average Ge-O bond distance under compression is also clarified in this work.","PeriodicalId":9413,"journal":{"name":"Canadian Journal of Physics","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83745811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0